package com.wfl.reggie.controller;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.conditions.update.LambdaUpdateWrapper;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.wfl.reggie.common.CustomException;
import com.wfl.reggie.common.R;
import com.wfl.reggie.dto.DishDto;
import com.wfl.reggie.entity.Category;
import com.wfl.reggie.entity.Dish;
import com.wfl.reggie.entity.DishFlavor;
import com.wfl.reggie.service.CategoryService;
import com.wfl.reggie.service.DishFlavorService;
import com.wfl.reggie.service.DishService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.web.bind.annotation.*;

import java.util.Arrays;
import java.util.List;
import java.util.Set;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;
import java.util.stream.Stream;

/**
 * 菜品管理
 */
@RestController
@RequestMapping("/dish")
@Slf4j
public class DishController {
    @Autowired
    private DishService dishService;

    @Autowired
    private DishFlavorService dishFlavorService;

    @Autowired
    private CategoryService categoryService;

    @Autowired
    private RedisTemplate redisTemplate;

    /**
     * 新增菜品
     * @param dishDto
     * @return
     */
    @PostMapping
    public R<String> save(@RequestBody DishDto dishDto){
        log.info(dishDto.toString());

        dishService.saveWithFlavor(dishDto);

        //清理所有菜品的缓存数据
        //Set keys = redisTemplate.keys("dish_*");
        //redisTemplate.delete(keys);

        //清理某个分类下面的菜品缓存数据
        String key = "dish_" + dishDto.getCategoryId() + "_1";
        redisTemplate.delete(key);

        return R.success("新增菜品成功");
    }

    /**
     * 分页查询
     * @param page
     * @param pageSize
     * @param name
     * @return
     */
    @GetMapping("/page")
    public R<Page> page(int page,int pageSize,String name){

        //构造分页构造器
        Page<Dish> pageInfo = new Page<>(page, pageSize);
        Page<DishDto> dishDtoPage = new Page<>();

        //条件构造器
        LambdaQueryWrapper<Dish> queryWrapper = new LambdaQueryWrapper<>();
        //添加过滤条件
        queryWrapper.like(name != null,Dish::getName,name);
        //添加排序条件
        queryWrapper.orderByDesc(Dish::getUpdateTime);

        //执行分页查询
        dishService.page(pageInfo,queryWrapper);

        //对象拷贝
        BeanUtils.copyProperties(pageInfo,dishDtoPage,"records");

        List<Dish> records = pageInfo.getRecords();

        List<DishDto> list = records.stream().map((item) -> {
            DishDto dishDto = new DishDto();

            BeanUtils.copyProperties(item, dishDto);

            Long categoryId = item.getCategoryId();//分类Id
            //根据id查分类对象
            Category category = categoryService.getById(categoryId);

            if (category != null) {
                String categoryName = category.getName();
                dishDto.setCategoryName(categoryName);
            }
            return dishDto;
        }).collect(Collectors.toList());

        dishDtoPage.setRecords(list);

        return R.success(dishDtoPage);
    }

    /**
     * 根据id查询菜品信息和对应的口味信息
     * @param id
     * @return
     */
    @GetMapping("/{id}")
    public R<DishDto> get(@PathVariable Long id){
        DishDto dishDto = dishService.getByIdWithFlavor(id);
        if(dishDto != null) {
            return R.success(dishDto);
        }
        return R.error("未找到菜品信息");
    }

    /**
     * 修改菜品
     * @param dishDto
     * @return
     */
    @PutMapping
    public R<String> update(@RequestBody DishDto dishDto){
        log.info(dishDto.toString());

        dishService.updateWithFlavor(dishDto);

        //清理所有菜品的缓存数据
        //Set keys = redisTemplate.keys("dish_*");
        //redisTemplate.delete(keys);

        //清理某个分类下面的菜品缓存数据
        String key = "dish_" + dishDto.getCategoryId() + "_1";
        redisTemplate.delete(key);

        return R.success("修改菜品成功");
    }

    /**
     * （可批量）1起售 0停售
     * @param flag
     * @param ids
     * @return
     */
    @PostMapping("/status/{flag}")
    public R<String> status(@PathVariable Integer flag, String[] ids){
        if (ids == null || ids.length == 0){
            throw new CustomException("参数有误");
        }
        LambdaUpdateWrapper<Dish> updateWrapper = new LambdaUpdateWrapper<>();
        //set()为sql中的set，in()为sql中的in
        updateWrapper.set(Dish::getStatus,flag).in(Dish::getId,ids);
        dishService.update(updateWrapper);
        return R.success(flag == 0 ? "已停售" : "已起售");
    }

    /**
     * 批量删除菜品，删除单个菜品(有缓存)
     * @param ids
     * @return
     */
//    @DeleteMapping
//    public R<String> delete(String[] ids){
//        if (ids == null ||ids.length == 0){
//            throw new CustomException("参数有误");
//        }
//        List<Dish> dishes = dishService.listByIds(Arrays.asList(ids));
//        for (Dish dish : dishes) {
//            if (dish.getStatus() != 0){
//                throw new CustomException(dish.getName() + "为起售状态，不能进行删除！");
//            }
//        }
//        LambdaUpdateWrapper<Dish> updateWrapper = new LambdaUpdateWrapper();
//        //set()为sql中的set，in()为sql中的in
//        updateWrapper.set(Dish::getIsDeleted,1).in(Dish::getId,ids);
//        dishService.update(updateWrapper);
//        return R.success("删除成功");
//    }

    /**
     * 批量删除菜品，删除单个菜品（无缓存）
     * @param ids
     * @return
     */
    @DeleteMapping
    public R<String> delete(@RequestParam("ids") List<Long> ids){
        //查看有没有被套餐使用
//        int count = this.getCount(ids);
//        if (count > 0){
//            throw new CustomException("该菜品正在套餐中售卖，无法进行删除")
//        }

        //看是否餐品正在售卖中？无法删除：可以删除
        ids.forEach((id) -> {
            Dish dish = dishService.getById(id);
            if (dish.getStatus() == 1){
                throw new CustomException("正在售卖中无法删除");
            }
        });
        //需要将器口味一起删除

        ids.stream().forEach((item) -> {
            //删除菜品
            dishService.removeById(item);
            //删除菜品关联的口味信息
            LambdaQueryWrapper<DishFlavor> queryWrapper = new LambdaQueryWrapper<>();
            queryWrapper.eq(DishFlavor::getDishId,item);
            dishFlavorService.remove(queryWrapper);
        });

        //清理所有菜品的缓存数据
        Set keys = redisTemplate.keys("dish_*");
        redisTemplate.delete(keys);

        //清理某个分类下面的菜品缓存数据
//        String key = "dish_" + dishDto.getCategoryId() + "_1";
//        redisTemplate.delete(key);

        return R.success("删除成功！！");
    }

    /**
     * 根据条件查询对应的菜品数据
     * @param dish
     * @return
     */
   /* @GetMapping("/list")
    public R<List<Dish>> list(Dish dish){

        //构造查询条件
        LambdaQueryWrapper<Dish> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(dish.getCategoryId() != null, Dish::getCategoryId,dish.getCategoryId());
        //添加条件，查询状态为1（起售）
        queryWrapper.eq(Dish::getStatus,1);

        //添加排序条件
        queryWrapper.orderByAsc(Dish::getSort).orderByDesc(Dish::getUpdateTime);

        List<Dish> list = dishService.list(queryWrapper);

        return R.success(list);
    }*/

    @GetMapping("/list")
    public R<List<DishDto>> list(Dish dish){
        List<DishDto> dishDtoList = null;

        //动态构造key
        String key = "dish_" + dish.getCategoryId() + "_" + dish.getStatus();//dish_132564885566_1

        //先从redis中获取缓存数据
        dishDtoList = (List<DishDto>) redisTemplate.opsForValue().get(key);

        if (dishDtoList != null){
            //如果存在，直接返回，无需查询数据库
            return R.success(dishDtoList);
        }


        //构造查询条件
        LambdaQueryWrapper<Dish> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(dish.getCategoryId() != null, Dish::getCategoryId,dish.getCategoryId());
        //添加条件，查询状态为1（起售）
        queryWrapper.eq(Dish::getStatus,1);

        //添加排序条件
        queryWrapper.orderByAsc(Dish::getSort).orderByDesc(Dish::getUpdateTime);

        List<Dish> list = dishService.list(queryWrapper);


        dishDtoList = list.stream().map((item) -> {
            DishDto dishDto = new DishDto();

            BeanUtils.copyProperties(item, dishDto);

            Long categoryId = item.getCategoryId();//分类Id
            //根据id查分类对象
            Category category = categoryService.getById(categoryId);

            if (category != null) {
                String categoryName = category.getName();
                dishDto.setCategoryName(categoryName);
            }

            //当前菜品的id
            Long dishId = item.getId();
            LambdaQueryWrapper<DishFlavor> lambdaQueryWrapper = new LambdaQueryWrapper<>();
            lambdaQueryWrapper.eq(DishFlavor::getDishId,dishId);
            //SQL: select * from dish_flavor where dish_id = ?
            List<DishFlavor> dishFlavorList = dishFlavorService.list(lambdaQueryWrapper);
            dishDto.setFlavors(dishFlavorList);

            return dishDto;
        }).collect(Collectors.toList());

        //如果不存在，需要查询数据库，将查询到的菜品数据缓存到redis
        redisTemplate.opsForValue().set(key,dishDtoList,60, TimeUnit.MINUTES);

        return R.success(dishDtoList);
    }

}
